A metal alloy is heated to a molten state and is poured into a shot sleeve of a vertical die cast press and on top of a shot piston. In one embodiment, the method comprises determining a target duty cycle of a PWM signal, determining the number of PWM cycles in the period of the PWM signal, pseudo-randomly selecting a duty cycle for each PWM cycle using one or more look-up tables and generating the PWM signal based on the duty cycle. It is possible to obtain the accurate viewership of an online live broadcast and to obtain the accurate viewership of the online live broadcast even when users erroneously access a web page or intentionally access the web page to increase the number of page views. The embedded relief may be treated to give it a contrasting color to the in situ formed bed liner. A proprietor may install interchangeable rail section covers to expose some, all, or none of the bays. Lighting control circuitry determines occupancy states based on motion detector output signals and sound detector output signals, and further controls associated lighting devices to be turned ON or OFF in accordance with determined occupancy states and an automatically adaptable timeout period.